Roll-bar for pulp-engines



(No Model.)

A. HANKEY.

ROLL BAR FOR PULP ENGINES.

No; 288,284. Patented Nov. 13, 1883.

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UNITED STATES PATENT OFFICEQ ANTHONS? HANKEY, OF ROGHDALE, MASSACHUSETTS.

ROLL-BAR FORPULP-ENGINES.

SPECIFICATION forming part of Letters Patent No. 288,234, dated November 13, 1883, Application filed August 30, 1888. (No model.)

To all whom it may concern:

Be it known that I, ANTHONY HANKEY, of Rochdale, in the county of lVorcester and Gommonwealth of Massachusetts, have invented certain new and useful Improvements in Roll-Bars for Pulp-Engines; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, in whicha Figure 1 represents a perspective view of a rollbar for pulp-engines embracing my invention; and Fig. 2 represents, upon an enlarged or full size, an end view of my improved rollbar.

lhe nature of my invention consists in a roll-bar for pulp-engines having its sides concave, as will be hereinafter described.

-In the drawings, the part marked A represents the roll-bar complete, which is to be applied to the rolls of pulp-engines in the usual way.

Roll-bars heretofore constructed have been made with the grinding parts of their blades 0 either straight or tapering, and in both cases objections have been found to exist in the practical operation of the device when applied to a pulp engine roll, since when straight the pulp material is by the action caused to escape from the advancing face of the blade or bar, while when the face or side of part 0 is made tapering or in wedge form from b to c, as indicated by the dotted lines, Fig. 2, the escape of the pulp material from the face of the blade or bar is still greater, all of which objections are obviated by my present invention, which consists in making the sides or faces of the parts C of the blade or bar A concave as indicated in full lines in the drawings at I) D. \Vith my improvement added, the rotation of the roll provided with bars having concave faces, the pulp material is scooped and carried down toward the bottom or bed, thereby insuring a I more perfect and expeditious grinding of the pulp material, which isaccomplished by the cutting or grinding surface E of the blade passing over the bed. As the blade or bar nears the bottom the pulp material is held by the concave face from rising up, and is therefore forced to the right and left, or from end to end of the blade or bar, thereby causing or inducing the material to flow in currents over the bed the best adapted to insure perfect and uniform work, as before indicated.

Thus far I have described the action of the concave face of the advancing blade or bar upon the pulp material; but the other or opposite concave face also has a tendency to suck or draw the pulp material after it, and thereby greatly aids in the operation of uniformly 111lX-. ing and grinding the material. Then, again, by making the faces of the part 0 of the blade concave, as shown, from b to e, the grinding face E of the bar can be ground off for a considerable distance up toward its center without materially changing the lateral relative positions of the edges of the part E to the bed of the machine, thereby enabling the user to run a roll provided with my improved bars or blades much longer than when bars or blades are used of the taper form.

It will be understood that the part 0 of the blade or bar is to be made of steel, or so much of it as used for grinding purposes; It will also be understood that in the old style of taper bars the grinding-edge E can be ground off but little without changing the lateral relative position of its edges to the bed, when the bar has to be replaced at great expense-a result obviated by my invention.

The head part B fits into the roll to which it is fastened by a holding-ring shrunk into the notches F, in the usual manner.

I claim 1 As any improved article of manufacture, a roll-bar for pulp-engines having the sides of the part 0 concave, substantially as and for the purposes set forth.

' ANTHONY HANKEY.

Witnesses:

HENRY L. MILLER, Tnos. H. Donen. 

